Tai Chi has been preliminarily demonstrated to improve sleep in older people. Favorable effects on sleep parameters have been reported in geriatric following 12 weeks to 6 months of Tai Chi training. The self-reported sleep quality is demonstrated to be improved by a 12-week of Tai Chi intervention in the senior residents in elderly home. Favorable effects of 12-week of Tai Chi training in patients with chronic heart failure are reported by showing the enhancement of sleep stability as assessed by sleep spectrogram. A longer period (6-month) of Tai Chi training has also been shown to improve the Pittsburgh Sleep Quality Index (PSQI)-indicated sleep quality in community-dwelling older adults. In older subjects with moderate sleep complaint or sleep-disturbance, 24/25-week of Tai Chi training is shown to improve the self-rated sleep quality, habitual sleep efficiency, sleep duration, and sleep disturbance.